Errors:
Some errors you can force others you can't. Dismiss the error window by clicking on Continue editing, hover the mouse over the red-bordered House Numbers to review what the errors are and fix the House Numbers which are in error, if they are indeed in error.
If an error is forceable the force button is displayed. But, the possibility to fix errors via forcing is dependant on your editor level. In The Netherlands L1 editors can use for some errors the force option, for other errors L2 is required. In Belgium and Luxembourg forcing is always limited to L2 and higher.
In the Netherlands the warning of even and odd numbers on the same side of the road is forceable for L1 editors.
An out of sequence error is also in the Netherlands limited to L2 and higher.
Read more in the global Wiki on Errors you can force.